Question

Organisms called methanogens are most abundant in a 

(a) cattle yard 

(b) polluted stream 

(c) hot spring 

(d) sulphur rock

Answer 1

The correct option is (a).

Explanation:

Methanogens are any of various archaebacteria that produce methane; they include genera such as Methanobacillus and Methanothrix. Methanogens are obligate anaerobes found in oxygen-deficient environments, such as marshes, swamps, sludge and the digestive systems of ruminants.